linux lsof command (lsof command)

lsofThe basic syntax of the command is as follows:

lsof [options]

Among them, optionsis an optional parameter, which can be used to specify lsofthe output format, filter conditions, etc.

The following are some commonly used lsofcommand options:

• -a: Indicates logical AND, used to specify the relationship between multiple filter conditions;
• -c: Indicates to filter by process name;
• -d: Indicates to filter by file descriptor;
• -g: Indicates to filter by group ID;
• -i: Indicates to filter by network connection;
• -p: Indicates to filter by process ID;
• -u: Indicates to filter by user ID;
• -t: Indicates that only the process ID is output;
• -F: Indicates the specified output format;
• -h: Indicates that the column name is not displayed;
• -n: Indicates that the host name is not resolved;
• -P: Indicates that the port number is not parsed;
• -r: Indicates the specified output interval time;
• -s: Indicates to filter by file size;
• -T: indicates the specified output format.

For example, to list all open files, the following command can be used:

lsof

To list the files opened by a specified process, the following command can be used:

lsof -p <pid>

To list the files opened by a specified user, the following command can be used:

lsof -u <username>

To list the processes for a specified filename, the following command can be used:

lsof <filename>

To list the processes for a specified port number, the following command can be used:

lsof -i :<port>

To list open files in a specified directory, you can use the following command:

lsof <directory>

In addition to the commonly used options above, lsofit also supports many other options, and you can man lsofview the complete help documentation through the command.